Chuck.



G. BODMER.

CHUCK. APPLICATION FILED SEPT. 4, 1914 Patented Mar. 23, 1915.

A, CZr'zJlza/z 19; 1/ ,mmmlw STATES PATENT orrica.

CHRIETIAN ZED/DEER, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE STANLEY RULE LEVEL CQHPANY, OF NEV BRITAIN, CONNECTICUT, A CORPORATION OF CQIJHECTICUE.

CHUCK.

Specification of Letters Yatent.

Patented Mar. 23, 1915.

Application filed September 4, 3914. Serial No. 8%,146

To ail ti iwfil it may cancer-n Be it known that 1, CHRLSTIAN Ber-Men, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have. invented certain new and useful improvements in Chucks, of which the following is a full, clear, and exact description.

My invention relates to improvements in chucks, the main object being to improve and simplify the construction, reducing the amount of friction generated in the operation of the chuck to a very substantial degree whereby the jaws may be effectively tightened upo the 501 by a hand alone.

Furthermore it is my aim to so improve the construction that the various parts may be easily assembled.

In the accompanying drawings- Figure 1 is a side elevation of my improved chuck. Fig. 2 is in the main, a centrel sectional view. Fig. 3 is a detail. Fig. 4 is a cross section on the plane of the line k -4:. Fig. 5 is a cross section on the plane of the line 5--5. Fig. 6 illustrates a modification. Fig. 7 is e detail thereof.

l the stem which is threaded at 2. The jaw actuating shell or sleeve comprises two separable parts 3 and l. Part 3 is in the form of a block having a central bore threaded to fit upon the thread 2.

4 is a hollow sleevelike member having.

practically unite the parts 3 and 4 when in operative position. If desired a screw 5 may be employed to lock the parts 3 and} together. 6"6-are tool clamping jaws in this instance three aws being proyided. Between the jaws are spacer springs 7-7 which normally operate to more the jaws apart. The base or rear ends of the jaws bear against an anti-friction Washer 8 Which may be termed a presser piece rotetably mounted on the inner end of the stenrl and preferably spaced therefrom by anti-friction balls 9-9. A screw 10 passing loosely through the Washer 8 and scrcwing into the inner end of the stem 1 serves'to hold the Washer S in its proper operative position friction balls 9 hear directly against the end or the stem 1, but if desired, a separate ball race-plate 11 may be provided between the washer S and the. stem 1 as shown in the modified form illustrated in Fig. 8. The head of the screw 10 acts as a fixed spacing element to hold the washer 8 at all times close to the end of the stem 1, so that it Will move to and fro therewith in the act of operating the jaws 66. The outer surface of the operating sleeve may he knurled as indicated in Fig. 1 to facilitate a hand grip. The washer 8 is of greater diameter than the screw passage through the part 3, and hence, the stem 1 cannot be unscrewed from the operating sleeve to such an extent as to permit the parts to become accidentally separated thus avoiding the danger of loss of parts.

In operation the stem 1 isbacked oil sulfi ciently to permit the jaws 6 --6 to open up so as to admit the shank of a tool. When the tool is in place the stem 1 is rotated in the sleeve in the direction to advance the resher S and thereby the jaws 6-4). As the 3aws move along the tapered internal wall of the sleeve element 4 they are contracted thereby and pressui into binding engagement with the tool. By reason of the presence of the anti-friction bearing the jaws may he set up very tightly upon the tool by tapered Wall, a plurality of tool-gripping jaws within sleeve engaging and being guided wholly by said tapered wall and be ing free to shift around said Wall. a jaw presser piece rotatably mounted at the innor end of said stem to be carried to and fro thereby, said presser piece engaging the gear ends of said jaws for operating the same on the movement of said stem.

2. In a chuck, a threaded tem, a hollow two-parisleeve, with means for positively connecting the same together, one part of said sleeveharing a screwthreaded passage to receive SfllitllI'QHdd stem, the other part \of' geld sleeve having an internal tapered Wa1l,=a plurality of toolgripping v jaws Within said sleeve engaging and being 1 mg free to shift around said wall, a jaw Presser piece 'rotatably mounted at the'inrear ends of'sai iided wholly by said tapered wall and bener end of said stem to be carried to and fro thereby, said resser-pieee engaging the d jaws for operating the same on the movement of said stem, said presser piece hem of larger diameter than {the diameter of t e threaded part of said stem.

nert I of said sleeve having an inter l guided wholly b tapered wall, a plurality of tool-gripping jaws within said sleeve engaging and being said tapered wall and bemg free to shi t around said wall, a jaw presser piece rotatably mounted at the inner end of said stem to be carried to and fro thereby, said presser piece engaging the rear ends of said jaws for operating the same on the movement of said stem, and a row of antifriction balls arranged between said resser piece and the adjacent end of said stem.

CHRISTIAN- BODMER.

Witnesses:

WILLIAM A. Bonwnnn, Home: Jm'm. 

